1 // SPDX-License-Identifier: BSD-2-Clause
2 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
3 *
4 * LibTomCrypt is a library that provides various cryptographic
5 * algorithms in a highly modular and flexible manner.
6 *
7 * The library is free for all purposes without any express
8 * guarantee it works.
9 */
10 #include "tomcrypt_private.h"
11
12 /**
13 @file lrw_decrypt.c
14 LRW_MODE implementation, Decrypt blocks, Tom St Denis
15 */
16
17 #ifdef LTC_LRW_MODE
18
19 /**
20 LRW decrypt blocks
21 @param ct The ciphertext
22 @param pt [out] The plaintext
23 @param len The length in octets, must be a multiple of 16
24 @param lrw The LRW state
25 */
lrw_decrypt(const unsigned char * ct,unsigned char * pt,unsigned long len,symmetric_LRW * lrw)26 int lrw_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_LRW *lrw)
27 {
28 int err;
29
30 LTC_ARGCHK(pt != NULL);
31 LTC_ARGCHK(ct != NULL);
32 LTC_ARGCHK(lrw != NULL);
33
34 if ((err = cipher_is_valid(lrw->cipher)) != CRYPT_OK) {
35 return err;
36 }
37
38 if (cipher_descriptor[lrw->cipher]->accel_lrw_decrypt != NULL) {
39 return cipher_descriptor[lrw->cipher]->accel_lrw_decrypt(ct, pt, len, lrw->IV, lrw->tweak, &lrw->key);
40 }
41
42 return lrw_process(ct, pt, len, LRW_DECRYPT, lrw);
43 }
44
45
46 #endif
47
48 /* ref: $Format:%D$ */
49 /* git commit: $Format:%H$ */
50 /* commit time: $Format:%ai$ */
51